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LibJS: Ensure Date tests can pass in any time zone by testing UTC values

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When we create a Date object from a timestamp, or set its value by way
of Date.prototype.setTime, the timestamp is interpreted as UTC. Change
test expecatations against such instances to use UTC as well.
This commit is contained in:
Timothy Flynn 2023-03-21 10:33:09 -04:00 • committed by Linus Groh
parent 8a27180fb8
commit 24459a44b0
2 changed files with 10 additions and 12 deletions
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10
Userland/Libraries/LibJS/Tests/builtins/Date/Date.js
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@ -14,16 +14,14 @@ test("timestamp constructor", () => {
// The timestamp constructor takes a timestamp in milliseconds since the start of the epoch, in UTC.
// 50 days and 1234 milliseconds after the start of the epoch.
// Most Date methods return values in local time, but since timezone offsets are less than 17 days,
// these checks will pass in all timezones.
let timestamp = 50 * 24 * 60 * 60 * 1000 + 1234;
let date = new Date(timestamp);
expect(date.getTime()).toBe(timestamp); // getTime() returns the timestamp in UTC.
expect(date.getMilliseconds()).toBe(234);
expect(date.getSeconds()).toBe(1);
expect(date.getFullYear()).toBe(1970);
expect(date.getMonth()).toBe(1); // Feb
expect(date.getUTCMilliseconds()).toBe(234);
expect(date.getUTCSeconds()).toBe(1);
expect(date.getUTCFullYear()).toBe(1970);
expect(date.getUTCMonth()).toBe(1); // Feb
date = new Date(NaN);
expect(date.getTime()).toBe(NaN);

12
Userland/Libraries/LibJS/Tests/builtins/Date/Date.prototype.setTime.js
View file

@ -22,9 +22,9 @@ test("Timestamp as argument", () => {
let date = new Date(2021, 0, 1);
date.setTime(1622993746000);
expect(date.getDate()).toBe(6);
expect(date.getMonth()).toBe(5);
expect(date.getFullYear()).toBe(2021);
expect(date.getUTCDate()).toBe(6);
expect(date.getUTCMonth()).toBe(5);
expect(date.getUTCFullYear()).toBe(2021);
expect(date.getUTCHours()).toBe(15);
expect(date.getUTCMinutes()).toBe(35);
expect(date.getUTCSeconds()).toBe(46);
@ -37,9 +37,9 @@ test("Make Invalid Date valid again", () => {
expect(date.getTime()).toBe(NaN);
date.setTime(1622993746000);
expect(date.getDate()).toBe(6);
expect(date.getMonth()).toBe(5);
expect(date.getFullYear()).toBe(2021);
expect(date.getUTCDate()).toBe(6);
expect(date.getUTCMonth()).toBe(5);
expect(date.getUTCFullYear()).toBe(2021);
expect(date.getUTCHours()).toBe(15);
expect(date.getUTCMinutes()).toBe(35);
expect(date.getUTCSeconds()).toBe(46);